F(x) = x + 6 if you know that the range is {2, 4}, the domain must be

Since the function is linear, we can do the following:

Plug in y=2 into the equation

2 = x+6
Subtract both sides by 6
x = -4

Plug in y=4 into the equation

4 = x+6
Subtract both sides by 6
x= -2

The domain of the function is {-4, -2}

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